Harald Welte is the chairman of the netfilter/iptables core team. His main interest in computing has always been networking. In the few time left besides netfilter/iptables related work, he's writing obscure documents like the UUCP over SSL HOWTO. Other kernel-related projects he has been contributing are user mode linux, the international (crypto) kernel patch, device drivers and the neighbour cache. He has been working as an independent IT Consultant working on projects for various companies ranging from banks to manufacturers of networking gear. During the year 2001 he was living in Curitiba (Brazil), where he got sponsored for his Linux related work by Conectiva Inc. Starting with February 2002, Harald has been contracted part-time by Astaro AG, who are sponsoring him for his current netfilter/iptables work. Aside from the Astaro sponsoring, he continues to work as a freelancing kernel developer and network security consultant. He licenses his software under the terms of the GNU GPL. He is determined to bring all users, distributors, value added resellers and vendors of netfilter/iptables based products in full compliance with the GPL, even if it includes raising legal charges. Harald is living in Berlin, Germany.